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प्रश्न
Which of the following statements are correct?
- Sound is produced by vibrations.
- Sound requires a medium for propagation.
- Light and sound both require a medium for propagation.
- Sound travels slower than light.
पर्याय
i & ii only
i, ii & iii only
ii, iii & iv only
i, ii & iv only
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उत्तर
i, ii & iv only
Explanation:
Because light can travel in vacuum also but it is only sound that requires a medium to travel.
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संबंधित प्रश्न
Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium.
Fill in the blank.
The number of times a body vibrates in one second is called its ______.
How do we produce sound ?
State the general name of the waves in which the particles of the medium vibrate :
(i) in the same direction as wave.
(ii) at right angles to the direction of wave.
Give two examples each of longitudinal waves and transverse waves.
The flash of a gun is seen by a man 3 seconds before the sound is heard. Calculate the distance of the gun from the man (Speed of sound in air is 332 m/s).
Which one of the following does not consist of transverse waves?
Complete the following sentence :
Sound is produced by a ___________ body.
Give scientific reasons.
In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.
